wasi-sockets: Add services database and implement getservbyname/getservbyport functions #1249

Job	Run time
Rustfmt	12s
wasi-headers test	0s
Build libc (ubuntu-latest, 10.0.0)	1m 52s
Build libc (macos-latest, 10.0.0)	2m 55s
Build libc (windows-latest, 10.0.0)	3m 17s
Build libc (ubuntu-latest, 16.0.0, x86_64-linux-gnu-ubuntu-18.04)	3m 26s
Build libc (macos-latest, 15.0.7, x86_64-apple-darwin21.0)	5m 35s
Build libc (windows-latest, 16.0.0)	4m 44s
	22m 1s

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